详解Log4j 日志文件存放位置设置

<context-param> 
  <param-name>webAppRootKey</param-name> 
  <param-value>webApp.root</param-value> 
 </context-param> 
 <context-param> 
 <param-name>log4jConfigLocation</param-name> 
  <param-value>classpath:log4j.properties</param-value> 
 </context-param> 
<listener>  
   <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>  
 </listener> 

log4j.appender.logfile.File=${user.home}/logs/app.log

public class log4jlistener implements ServletContextListener { 
  public static final String log4jdirkey = "log4jdir"; 
  public void contextDestroyed(ServletContextEvent servletcontextevent) { 
    System.getProperties().remove(log4jdirkey); 
  } 
  public void contextInitialized(ServletContextEvent servletcontextevent) { 
  String log4jdir = servletcontextevent.getServletContext().getRealPath("/"); 
  //System.out.println("log4jdir:"+log4jdir); 
  System.setProperty(log4jdirkey, log4jdir); 
  } 
} 

<listener> 
  <listener-class>com.log4j.log4jlistener</listener-class> 
</listener>